Would this be normal?

So to start my boyfriend has a ex he had a child with and he has to interact with her on some weekends when he picks up his child and i think he has more just a friendly talk for the sake of their child more of a heart felt conversation for example when they talk he will state his accomplishments or even ask her for advice to better organize his apartment or advice on managing his finances etc.. When i tell him about my feelings on this he just says I'm just trying to start a argument even when I'm trying my best to tell him calmly... Oh yeah another thing one of the reasons he told him she left is cause he lost his high paying job and he just now got back so when i told him she would probably try to get back together with him he said she is married and i said no they are probably or obviously in a rough patch cause she will sometimes arrrive with the ring on and sometimes not